boost/fusion/functional/invocation/invoke.hpp
/*=============================================================================
Copyright (c) 2005-2006 Joao Abecasis
Copyright (c) 2006-2007 Tobias Schwinger
Use modification and distribution are subject to the Boost Software
License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
==============================================================================*/
#if !defined(BOOST_FUSION_FUNCTIONAL_INVOCATION_INVOKE_HPP_INCLUDED)
#if !defined(BOOST_PP_IS_ITERATING)
#include <boost/preprocessor/cat.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/arithmetic/dec.hpp>
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_shifted.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/mpl/or.hpp>
#include <boost/mpl/front.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/function_types/is_function.hpp>
#include <boost/function_types/is_callable_builtin.hpp>
#include <boost/function_types/is_member_pointer.hpp>
#include <boost/function_types/is_member_function_pointer.hpp>
#include <boost/function_types/result_type.hpp>
#include <boost/function_types/parameter_types.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/fusion/sequence/intrinsic/at.hpp>
#include <boost/fusion/sequence/intrinsic/size.hpp>
#include <boost/fusion/sequence/intrinsic/front.hpp>
#include <boost/fusion/sequence/intrinsic/begin.hpp>
#include <boost/fusion/iterator/next.hpp>
#include <boost/fusion/iterator/deref.hpp>
#include <boost/fusion/functional/invocation/limits.hpp>
#include <boost/fusion/functional/invocation/detail/that_ptr.hpp>
namespace boost { namespace fusion
{
namespace result_of
{
template <typename Function, class Sequence> struct invoke;
}
template <typename Function, class Sequence>
inline typename result_of::invoke<Function, Sequence>::type
invoke(Function, Sequence &);
template <typename Function, class Sequence>
inline typename result_of::invoke<Function, Sequence const>::type
invoke(Function, Sequence const &);
//----- ---- --- -- - - - -
namespace detail
{
namespace ft = function_types;
template<
typename Function, class Sequence,
int N = result_of::size<Sequence>::value,
bool CBI = ft::is_callable_builtin<Function>::value,
bool RandomAccess = traits::is_random_access<Sequence>::value
>
struct invoke_impl;
template <class Sequence, int N>
struct invoke_param_types;
template <typename T, class Sequence>
struct invoke_data_member;
template <typename Function, class Sequence, int N, bool RandomAccess>
struct invoke_mem_fn;
#define BOOST_PP_FILENAME_1 <boost/fusion/functional/invocation/invoke.hpp>
#define BOOST_PP_ITERATION_LIMITS (0, BOOST_FUSION_INVOKE_MAX_ARITY)
#include BOOST_PP_ITERATE()
template <typename F, class Sequence, int N, bool RandomAccess>
struct invoke_nonmember_builtin
// use same implementation as for function objects but...
: invoke_impl< // ...work around boost::result_of bugs
typename mpl::eval_if< ft::is_function<F>,
boost::add_reference<F>, boost::remove_cv<F> >::type,
Sequence, N, false, RandomAccess >
{ };
template <typename Function, class Sequence, int N, bool RandomAccess>
struct invoke_impl<Function,Sequence,N,true,RandomAccess>
: mpl::if_< ft::is_member_function_pointer<Function>,
invoke_mem_fn<Function,Sequence,N,RandomAccess>,
invoke_nonmember_builtin<Function,Sequence,N,RandomAccess>
>::type
{ };
template <typename Function, class Sequence, bool RandomAccess>
struct invoke_impl<Function,Sequence,1,true,RandomAccess>
: mpl::eval_if< ft::is_member_pointer<Function>,
mpl::if_< ft::is_member_function_pointer<Function>,
invoke_mem_fn<Function,Sequence,1,RandomAccess>,
invoke_data_member<Function, Sequence> >,
mpl::identity< invoke_nonmember_builtin<
Function,Sequence,1,RandomAccess> >
>::type
{ };
template <typename T, class C, class Sequence>
struct invoke_data_member< T C::*, Sequence >
{
private:
typedef typename result_of::front<Sequence>::type that;
typedef mpl::or_< boost::is_convertible<that,C*>,
boost::is_convertible<that,C&>,
non_const_pointee<that> > non_const_cond;
typedef typename mpl::eval_if< non_const_cond,
mpl::identity<C>, add_const<C> >::type qualified_class;
typedef typename mpl::eval_if< non_const_cond,
mpl::identity<T>, add_const<T> >::type qualified_type;
public:
typedef typename boost::add_reference<qualified_type>::type
result_type;
static inline result_type call(T C::* f, Sequence & s)
{
typename result_of::front<Sequence>::type c = fusion::front(s);
return that_ptr<qualified_class>::get(c)->*f;
}
};
}
namespace result_of
{
template <typename Function, class Sequence> struct invoke
{
typedef typename detail::invoke_impl<
typename boost::remove_reference<Function>::type, Sequence
>::result_type type;
};
}
template <typename Function, class Sequence>
inline typename result_of::invoke<Function,Sequence>::type
invoke(Function f, Sequence & s)
{
return detail::invoke_impl<
typename boost::remove_reference<Function>::type,Sequence
>::call(f,s);
}
template <typename Function, class Sequence>
inline typename result_of::invoke<Function,Sequence const>::type
invoke(Function f, Sequence const & s)
{
return detail::invoke_impl<
typename boost::remove_reference<Function>::type,Sequence const
>::call(f,s);
}
}}
#define BOOST_FUSION_FUNCTIONAL_INVOCATION_INVOKE_HPP_INCLUDED
#else // defined(BOOST_PP_IS_ITERATING)
///////////////////////////////////////////////////////////////////////////////
//
// Preprocessor vertical repetition code
//
///////////////////////////////////////////////////////////////////////////////
#define N BOOST_PP_ITERATION()
template <typename Function, class Sequence>
struct invoke_impl<Function,Sequence,N,false,true>
{
public:
typedef typename boost::result_of<
#define M(z,j,data) typename result_of::at_c<Sequence,j>::type
Function(BOOST_PP_ENUM(N,M,~)) >::type result_type;
#undef M
#if N > 0
template <typename F>
static inline result_type
call(F & f, Sequence & s)
{
#define M(z,j,data) fusion::at_c<j>(s)
return f( BOOST_PP_ENUM(N,M,~) );
}
#else
template <typename F>
static inline result_type
call(F & f, Sequence & /*s*/)
{
return f();
}
#endif
};
#if N > 0
template <typename Function, class Sequence>
struct invoke_mem_fn<Function,Sequence,N,true>
{
public:
typedef typename ft::result_type<Function>::type result_type;
template <typename F>
static inline result_type
call(F & f, Sequence & s)
{
return (that_ptr<typename mpl::front<
ft::parameter_types<Function> >::type
>::get(fusion::at_c<0>(s))->*f)(BOOST_PP_ENUM_SHIFTED(N,M,~));
}
};
#endif
#undef M
#define M(z,j,data) \
typename seq::I##j i##j = \
fusion::next(BOOST_PP_CAT(i,BOOST_PP_DEC(j)));
template <typename Function, class Sequence>
struct invoke_impl<Function,Sequence,N,false,false>
{
private:
typedef invoke_param_types<Sequence,N> seq;
public:
typedef typename boost::result_of<
Function(BOOST_PP_ENUM_PARAMS(N,typename seq::T))
>::type result_type;
#if N > 0
template <typename F>
static inline result_type
call(F & f, Sequence & s)
{
typename seq::I0 i0 = fusion::begin(s);
BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
return f( BOOST_PP_ENUM_PARAMS(N,*i) );
}
#else
template <typename F>
static inline result_type
call(F & f, Sequence & /*s*/)
{
return f();
}
#endif
};
#if N > 0
template <typename Function, class Sequence>
struct invoke_mem_fn<Function,Sequence,N,false>
{
private:
typedef invoke_param_types<Sequence,N> seq;
public:
typedef typename ft::result_type<Function>::type result_type;
template <typename F>
static inline result_type
call(F & f, Sequence & s)
{
typename seq::I0 i0 = fusion::begin(s);
BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
return (that_ptr< typename mpl::front<
ft::parameter_types<Function> >::type
>::get(*i0)->*f)(BOOST_PP_ENUM_SHIFTED_PARAMS(N,*i));
}
};
#endif
#undef M
template <class Sequence> struct invoke_param_types<Sequence,N>
{
#if N > 0
typedef typename result_of::begin<Sequence>::type I0;
typedef typename result_of::deref<I0>::type T0;
#define M(z,i,data) \
typedef typename result_of::next< \
BOOST_PP_CAT(I,BOOST_PP_DEC(i))>::type I##i; \
typedef typename result_of::deref<I##i>::type T##i;
BOOST_PP_REPEAT_FROM_TO(1,N,M,~)
#undef M
#endif
};
#undef N
#endif // defined(BOOST_PP_IS_ITERATING)
#endif
